The Clark Planetarium opened on 11 April 2003 and was built as a replacement for the Hansen Planetarium. The ATK IMAX Theatre at the Clark Planetarium was the first IMAX theater in Utah and has 70-foot wide screen. The Hansen Star Theatre has a 55-foot domed screen and the world's first digital star projection system. The planetarium also has free exhibits, including scale models of the planets of the solar system and recreations of the lunar and Martian landscapes.